<template>
	<div class="app-container">
		<!-- 顶部 Header 区域 -->
		<mt-header fixed title='黑马程序员·Vue项目'>
			<span slot='left' @click='goBack' v-show='flag'>
				<mt-button icon='back'>返回</mt-button>
			</span>
		</mt-header>


		<!-- 中间的路由 router-view 区域 -->
		<transition>
			<router-view></router-view>
		</transition>

		<!-- 底部 Tabbar 区域 -->
		<nav class="mui-bar mui-bar-tab">
			<router-link class="mui-tab-item-lww" to='/home'>
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="mui-tab-item-lww" to='/member'>
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="mui-tab-item-lww" to='/shopcar'>
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart"><span class="mui-badge" id="badge">{{ $store.getters.getAllCount }}</span></span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="mui-tab-item-lww" to='/search'>
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>
	</div>
</template>

<script>
	export default {
		data() {
			return {
				flag: false // 返回按钮的标识符
			}
		},
		created() {
			this.flag = this.$route.path === '/home' ? false : true;
		},
		methods: {
			goBack() {
				// 点击后退按钮
				this.$router.go(-1);
			}
		},
		watch: {
			'$route.path': function(newVal) {
				if(newVal === '/home') {
					this.flag = false;
				} else {
					this.flag = true;
				}
			}
		}
	}
</script>


<style lang='scss' scoped>
	.mint-header {
		z-index: 99;
	}

	.app-container {
		padding-top: 40px;
		padding-bottom: 50px;
		overflow-x: hidden;
	}

	.v-enter{
		opacity: 0;
		transform: translateX(100%);
	}

	.v-leave-to {
		opacity: 0;
		transform: translateX(-100%);
		position: absolute;
	}

	.v-enter-active,
	.v-leave-active {
		transition: all 0.5s ease;
	}


	/*给 tabbar 改类名，解决点击无法切换的问题*/
	.mui-bar-tab .mui-tab-item-lww.mui-active {
	    color: #007aff;
	}

	.mui-bar-tab .mui-tab-item-lww {
	    display: table-cell;
	    overflow: hidden;
	    width: 1%;
	    height: 50px;
	    text-align: center;
	    vertical-align: middle;
	    white-space: nowrap;
	    text-overflow: ellipsis;
	    color: #929292;
	}

	.mui-bar-tab .mui-tab-item-lww .mui-icon {
	    top: 3px;
	    width: 24px;
	    height: 24px;
	    padding-top: 0;
	    padding-bottom: 0;
	}

	.mui-bar-tab .mui-tab-item-lww .mui-icon~.mui-tab-label {
	    font-size: 11px;
	    display: block;
	    overflow: hidden;
	    text-overflow: ellipsis;
	}
</style>